Let’s use your own paradigm and see where it gets us.
You claim a woman has a right to terminate the life of the child in her womb because that life has not achieved the moral standing of personhood that you believe is the cut off for granting the right to life.
Given that the fetus is not a person with rights, the mother can kill and dismember that child, and have it removed if she wills to. She can give to another (a doctor) the authority to complete that act of terminating the child because the child is within her domain.
Presumably the fetus, as far as you are concerned, has no more moral rights than a monkey, a pig, a chicken, or (going far enough back in the fetal development stages) to an insect such as an ant or bug.
You would, I presume, argue that the difference in sophistication between a human person and a chicken or insect means that a human person need have no moral qualms about stepping on an ant, a caterpillar, or a beetle?
Would that be about right?
Well, let’s explore this notion a bit, shall we?
If the God of classical theism exists and has the characteristics he is conceived to have - infinite knowledge, infinite power, infinite goodness and absolute domain over all that exists, then the relationship that God has vis a vis human beings is akin to the relationship you or any human person enjoys with a bug or a caterpillar.
In fact, given that the traits of God are infinitely beyond your traits, then God in fact enjoys an infinitely higher moral standing than you do as compared to a bug or caterpillar or a FETUS.
Ergo, by your very own argument - that YOUR superiority of person over a fetus or a bug permits YOU to terminate those inferior, non-person, lives without any moral compunction whatsoever - then ipso facto the infinite superiority of God over you provides him with the same moral justification for terminating (even by cruelly dismembering) any human life he wills, including yours.
The chicken or bug or fetus has no say in the matter of losing their lives because you have unilaterally determined by your superiority over them that you can act as you will regarding whether they live or not.
This is your argument, one that a fortiori can be assumed to justify God’s infinite superiority with regard to willing and calling for the slaughter of human beings as he wills or commands just as you assert that a mother can rightfully have the fetus in her womb terminated if she so wills and calls for the abortion doctor to do so.
This is your very own argument that justifies God terminating any developed human life by the very same warrant a woman is justified in terminating a developing human fetus.
Tis the sport to have the engineer hoist with his own petard.